554 validating sender Adult chatrrom

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If you have received any other error message from our servers, please contact us here.For administrative reasons, email delivery is temporarily not permitted.

The email has been rejected due to our current security policy.

Please use a different method to contact the person in question and inform them of the situation.

To reduce spam email reception, we use popular DNSBL-lists (DNS based Blackhole List).

My client's IT guy says we're not being blocked, but I cant think of any other reason the bounce would occur.

Any suggestions on what questions to ask or how to fix this would be helpful.

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